pipewire: add rtp sink, for casting to phone

user/home.nix

@@ -15,6 +15,7 @@
     ./mpv.nix
     ./mangohud.nix
     ./rnnoise.nix
+    ./rtp-sink.nix
     ./mimeapps.nix
     ./chat.nix
     ./email.nix

user/rtp-sink.nix

@@ -0,0 +1,35 @@
+{ config, pkgs, lib, ... }: {
+  # RNNoise is a noise supperssion neural network
+  # Here we use it as a plugin for pipewire to create a virtual microphone
+  config = {
+    home.file = {
+      ".config/pipewire/pipewire.conf.d/99-rtp-sink.conf".text = ''
+         context.modules = [
+         {   name = libpipewire-module-rtp-sink
+             args = {
+                 node.description = "Phone rtp receiver"
+
+                 #sap.ip = "224.0.0.56"
+                 #sap.port = 9875
+                 #source.ip = "0.0.0.0"
+                 destination.ip = "192.168.0.100"
+                 destination.port = 4010
+                 #local.ifname = "eth0"
+                 net.mtu = 320
+                 #net.ttl = 1
+                 #net.loop = false
+                 #sess.name = "PipeWire RTP stream"
+                 #audio.format = "S16BE"
+                 audio.rate = 48000
+                 audio.channels = 2
+                 audio.position = [ FL FR ]
+                 stream.props = {
+                     node.name = "rtp-sink"
+                 }
+             }
+        }
+        ]
+      '';
+    };
+  };
+}